Here are a few things to check:

• Recurring tasks appear in Tasks > Recurring Tasks. Make sure you’re viewing the correct section.
• Use the search and filter options to find your task.
• If you just created the task, confirm you clicked "Save & View Tasks."
• Check if filters or date ranges are hiding your task.

Also please note the Recurring Task will not appear on the Task list until the day of the Creation Date you have set.

If you have Completed the Task the new one will not show until the Creation Date.